diff --git a/src/alg_sec.cpp b/src/alg_sec.cpp
index b25eabd9..30a174c9 100644
--- a/src/alg_sec.cpp
+++ b/src/alg_sec.cpp
@@ -592,35 +592,4 @@ void algsec_detect(ctx_cam *cam){
 
 }
 
-void algsec_primary(ctx_cam *cam){
-    /*This function runs on the camera thread */
-    #ifdef HAVE_OPENCV
-        Mat mat_dst, mat_out, mat_fgmsk;
-        int imgsize;
-
-        mythreadname_set("pcv",cam->threadnr,cam->conf->camera_name.c_str());
-
-        imgsize = (cam->imgs.height * cam->imgs.width * 3) / 2;
-        cam->current_image->diffs=2000;
-
-        Ptr<BackgroundSubtractor> pBackSub;
-        pBackSub = createBackgroundSubtractorMOG2();
-
-        Mat mat_src = Mat(cam->imgs.height*3/2, cam->imgs.width
-            , CV_8UC1, (void*)cam->current_image->image_norm);
-        cvtColor(mat_src, mat_dst, COLOR_YUV2RGB_YV12);
-
-        pBackSub->apply(mat_dst, mat_fgmsk,0);
-
-        cvtColor(mat_fgmsk, mat_out, COLOR_BGR2YUV_I420);
-        memcpy(cam->imgs.image_motion.image_norm,(unsigned char*)mat_out.data,imgsize);
-
-        mythreadname_set("ml",cam->threadnr,cam->conf->camera_name.c_str());
-
-    #else
-        (void)cam;
-    #endif
-
-}
-
 
diff --git a/src/alg_sec.hpp b/src/alg_sec.hpp
index 594e4192..6053c419 100644
--- a/src/alg_sec.hpp
+++ b/src/alg_sec.hpp
@@ -54,6 +54,5 @@ struct ctx_algsec {
 void algsec_detect(ctx_cam *cam);
 void algsec_init(ctx_cam *cam);
 void algsec_deinit(ctx_cam *cam);
-void algsec_primary(ctx_cam *cam);
 
 #endif
\ No newline at end of file
diff --git a/src/motion_loop.cpp b/src/motion_loop.cpp
index 59e5056c..7af8caa2 100644
--- a/src/motion_loop.cpp
+++ b/src/motion_loop.cpp
@@ -899,18 +899,15 @@ static void mlp_detection(struct ctx_cam *cam){
     }
 
     if ( !cam->pause ) {
-        if (cam->conf->primary_method == 0){
+        if (cam->conf->primary_method == 1) {
+            alg_new_diff(cam);
+        } else if (cam->conf->primary_method == 0){
             alg_diff(cam);
             alg_lightswitch(cam);
             alg_switchfilter(cam);
             alg_despeckle(cam);
             alg_tune_smartmask(cam);
-        } else if (cam->conf->primary_method == 1) {
-            alg_new_diff(cam);
-        } else if (cam->conf->primary_method == 2) {
-            algsec_primary(cam);
         }
-
     } else {
         cam->current_image->diffs = 0;
     }
@@ -938,8 +935,6 @@ static void mlp_tuning(struct ctx_cam *cam){
 
     if (cam->conf->primary_method == 0){
         alg_update_reference_frame(cam, UPDATE_REF_FRAME);
-    } else {
-        alg_new_update_frame(cam);
     }
 
     cam->previous_diffs = cam->current_image->diffs;